I used to never have a problem sending pics and surfing the web while on a phone call, but since I've jb I've noticed I can't do it sometimes. Sometimes I lose signal or only run on 4g in an lte area. I have to go into my settings and toggle the lte on and off and then its fine. Is this a carrier issue or perhaps a hardware issue? I have a 6 by the way running 8.1 jb on pang. Thanks